Inspired by the "Happy Fun Ball" from the web series Critical Role, The Cube of Vanya is a magical adventure through demi-planes created by an ancient wizard, now destabilized by a malevolent dragon. The adventurers find themselves trapped within a series of themed planes with no idea how they got there. Navigating these planes to find a means of escape, they uncover the secrets of the cube while piecing back together their own memory. During the campaign the adventurers may fight shadow demons in an inn which is really a prison, flee a tornado while perched perilously in the sky, forge a weapon within a volcano, and much more. The module is structured in a non linear manner allowing the adventurers to choose their own way, or for the DM to pick and choose their favourite bits to highlight. The adventure was written with four level 5 players in mind but it would be easy to tweak for different sized groups around that level.

The rubble-strewn passageway twists and turns, winding ever deeper into the mountain, lower and lower into the bowels of the ancient, forbidding halls of long-dead dwarves. The torchlight flickers, threatening to succumb to the oppressive darkness. Creeping along one striated granite wall, Arikus the warrior moves cautiously toward the great cavern ahead, its sides and walls disappearing into the gloomy distance. Cocking his head to one side to listen, he holds his hand up for a moment, demanding unconditional quiet from from his companions. Then , his arm relaxing in relief, he waves everyone forward and moves into the open. Before him, scattered to the far walls of the enormous cavern, are piles upon piles of glittering treasure - coins from countless kingdoms, sparkling gems, exquisite jewelry, and items of wondrous power - enough for twenty kings' ransoms. Arikus laughs gleefully, thrusting both hands into the nearest cache of coins to let them runs through his fingers. At that moment, a monstrous shadow looms threateningly over him. Looking up, Arikus blanches and stumbles back in horror before the terrible visage of a Great Red Wyrm. The fearsome dragon opens its razor-filled maw and spews forth a gout of white-hot flame, engulfing the hapless warrior.... The ultimate Dungeon Master Fantasy! This is the most deluxe dungeon. Designed to appeal to discriminating and demanding role-players. Adventurers, beware. This is more than just a dragon hunt. Within the lair of the beast lie cruel and deadly traps, befuddling conundrums and puzzles, and cunning minions that will be the end of overconfident or careless adventurers. Comprised of three 64-page books, for two adventures that link to one super-campaign 12 full-color reference cards 16 special player handouts Eight Monstrous Compendium sheets A Sheet of cardstock standups with 24 plastic bases. Six full-color poster maps, two of which link together to make a giant tactical playing surface for use with miniatures or the included cardstock figures. TSR 1089